var items = document.getElementsByName('menu__');

function getFolder(url) {
	var pos = url.lastIndexOf('/');
	var url2 = url.substr(0, pos);
	var pos2 = url2.lastIndexOf('/');
	var folder = url2.substr(pos2+1);
	return folder;
}

var baseUrlFolder = getFolder(window.parent.location.href);

for(var i=0; i<items.length; i++) {
   var anchor = items[i];
   if(getFolder(anchor.href) == baseUrlFolder)
     anchor.className = "navcontentactive";
}